Scale token generation back

1 files changed, 19 insertions, 163 deletions

diff --git a/xtask/src/codegen/gen_syntax.rs b/xtask/src/codegen/gen_syntax.rs
index 4c9e447a304..ce18f2b8f94 100644
--- a/xtask/src/codegen/gen_syntax.rs
+++ b/xtask/src/codegen/gen_syntax.rs
@@ -3,10 +3,7 @@
 //! Specifically, it generates the `SyntaxKind` enum and a number of newtype
 //! wrappers around `SyntaxNode` which implement `ra_syntax::AstNode`.
 
-use std::{
-    borrow::Cow,
-    collections::{BTreeSet, HashSet},
-};
+use std::collections::{BTreeSet, HashSet};
 
 use proc_macro2::{Punct, Spacing};
 use quote::{format_ident, quote};
@@ -26,10 +23,6 @@ pub fn generate_syntax(mode: Mode) -> Result<()> {
     let contents = generate_nodes(KINDS_SRC, AST_SRC)?;
     update(ast_nodes_file.as_path(), &contents, mode)?;
 
-    let ast_tokens_file = project_root().join(codegen::AST_TOKENS);
-    let contents = generate_tokens(KINDS_SRC, AST_SRC)?;
-    update(ast_tokens_file.as_path(), &contents, mode)?;
-
     Ok(())
 }
 
@@ -40,147 +33,7 @@ struct ElementKinds {
     has_tokens: bool,
 }
 
-fn generate_tokens(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
-    let all_token_kinds: Vec<_> = kinds
-        .punct
-        .into_iter()
-        .map(|(_, kind)| kind)
-        .copied()
-        .map(|x| x.into())
-        .chain(
-            kinds
-                .keywords
-                .into_iter()
-                .chain(kinds.contextual_keywords.into_iter())
-                .map(|name| Cow::Owned(format!("{}_KW", to_upper_snake_case(&name)))),
-        )
-        .chain(kinds.literals.into_iter().copied().map(|x| x.into()))
-        .chain(kinds.tokens.into_iter().copied().map(|x| x.into()))
-        .collect();
-
-    let tokens = all_token_kinds.iter().filter_map(|kind_str| {
-        if kind_str.ends_with("_KW") {
-            return None;
-        }
-        let kind_str = &**kind_str;
-        let kind = format_ident!("{}", kind_str);
-        let name = format_ident!("{}", to_pascal_case(kind_str));
-        let res = quote! {
-            #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-            pub struct #name {
-                pub(crate) syntax: SyntaxToken,
-            }
-
-            impl std::fmt::Display for #name {
-                fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-                    std::fmt::Display::fmt(&self.syntax, f)
-                }
-            }
-
-            impl AstToken for #name {
-                fn can_cast(kind: SyntaxKind) -> bool { kind == #kind }
-                fn cast(syntax: SyntaxToken) -> Option<Self> {
-                    if Self::can_cast(syntax.kind()) { Some(Self { syntax }) } else { None }
-                }
-                fn syntax(&self) -> &SyntaxToken { &self.syntax }
-            }
-        };
-        Some(res)
-    });
-
-    let enums = grammar.token_enums.iter().map(|en| {
-        let variants = en.variants.iter().map(|var| format_ident!("{}", var)).collect::<Vec<_>>();
-        let name = format_ident!("{}", en.name);
-        let kinds = variants
-            .iter()
-            .map(|name| format_ident!("{}", to_upper_snake_case(&name.to_string())))
-            .collect::<Vec<_>>();
-        assert!(en.traits.is_empty());
-
-        quote! {
-                #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-                pub enum #name {
-                    #(#variants(#variants),)*
-                }
-
-                #(
-                impl From<#variants> for #name {
-                    fn from(node: #variants) -> #name {
-                        #name::#variants(node)
-                    }
-                }
-                )*
-
-                impl std::fmt::Display for #name {
-                    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-                        std::fmt::Display::fmt(self.syntax(), f)
-                    }
-                }
-
-                impl AstToken for #name {
-                    fn can_cast(kind: SyntaxKind) -> bool {
-                        match kind {
-                            #(#kinds)|* => true,
-                            _ => false,
-                        }
-                    }
-                    fn cast(syntax: SyntaxToken) -> Option<Self> {
-                        let res = match syntax.kind() {
-                            #(
-                            #kinds => #name::#variants(#variants { syntax }),
-                            )*
-                            _ => return None,
-                        };
-                        Some(res)
-                    }
-                    fn syntax(&self) -> &SyntaxToken {
-                        match self {
-                            #(
-                            #name::#variants(it) => &it.syntax,
-                            )*
-                        }
-                    }
-                }
-        }
-    });
-
-    crate::reformat(quote! {
-        use crate::{SyntaxToken, SyntaxKind::{self, *}, ast::AstToken};
-
-        #(#tokens)*
-        #(#enums)*
-    })
-}
-
 fn generate_nodes(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
-    let all_token_kinds: Vec<_> = kinds
-        .punct
-        .into_iter()
-        .map(|(_, kind)| kind)
-        .copied()
-        .map(|x| x.into())
-        .chain(
-            kinds
-                .keywords
-                .into_iter()
-                .chain(kinds.contextual_keywords.into_iter())
-                .map(|name| Cow::Owned(format!("{}_KW", to_upper_snake_case(&name)))),
-        )
-        .chain(kinds.literals.into_iter().copied().map(|x| x.into()))
-        .chain(kinds.tokens.into_iter().copied().map(|x| x.into()))
-        .collect();
-
-    let mut token_kinds = HashSet::new();
-    for kind in &all_token_kinds {
-        let kind = &**kind;
-        let name = to_pascal_case(kind);
-        token_kinds.insert(name);
-    }
-
-    for en in grammar.token_enums {
-        token_kinds.insert(en.name.to_string());
-    }
-
     let nodes = grammar.nodes.iter().map(|node| {
         let name = format_ident!("{}", node.name);
         let kind = format_ident!("{}", to_upper_snake_case(&name.to_string()));
@@ -207,19 +60,9 @@ fn generate_nodes(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
                         }
                     }
                 } else {
-                    let is_token = token_kinds.contains(&ty.to_string());
-                    if is_token {
-                        let method_name = format_ident!("{}_token", method_name);
-                        quote! {
-                            pub fn #method_name(&self) -> Option<#ty> {
-                                support::token(&self.syntax)
-                            }
-                        }
-                    } else {
-                        quote! {
-                            pub fn #method_name(&self) -> Option<#ty> {
-                                support::child(&self.syntax)
-                            }
+                    quote! {
+                        pub fn #method_name(&self) -> Option<#ty> {
+                            support::child(&self.syntax)
                         }
                     }
                 }
@@ -338,8 +181,6 @@ fn generate_nodes(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
             T,
         };
 
-        use super::tokens::*;
-
         #(#nodes)*
         #(#enums)*
         #(#displays)*
@@ -456,6 +297,8 @@ fn generate_syntax_kinds(grammar: KindsSrc<'_>) -> Result<String> {
         macro_rules! T {
             #((#punctuation_values) => { $crate::SyntaxKind::#punctuation };)*
             #((#all_keywords_idents) => { $crate::SyntaxKind::#all_keywords };)*
+            (lifetime) => { $crate::SyntaxKind::LIFETIME };
+            (ident) => { $crate::SyntaxKind::IDENT };
         }
     };
 
@@ -535,8 +378,21 @@ impl Field<'_> {
                     "')'" => "r_paren",
                     "'['" => "l_brack",
                     "']'" => "r_brack",
+                    "<" => "l_angle",
+                    ">" => "r_angle",
                     "=" => "eq",
                     "!" => "excl",
+                    "*" => "star",
+                    "&" => "amp",
+                    "_" => "underscore",
+                    "." => "dot",
+                    ".." => "dotdot",
+                    "..." => "dotdotdot",
+                    "=>" => "fat_arrow",
+                    "@" => "at",
+                    ":" => "colon",
+                    "::" => "coloncolon",
+                    "#" => "pound",
                     _ => name,
                 };
                 format_ident!("{}_token", name)